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Water absorption refers to a material's ability to absorb water into its structure. 

Weldable refers to a material's ability to be joined by welding. 

Wet adhesives are adhesives that are applied in liquid form and harden by evaporation of the solvent or by chemical reaction. 

Wetting is the extent of the contact area between the adhesive and the part to be joined. It depends on the type of adhesive and the nature of the surface of the part to be joined.